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28101 Ballard Dr, Lake Forest, IL 60045, USA
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Harvia M3 SL Wood Burning Sauna Stove
Heater
Sale price
$1,416.00
Regular price
$1,571.76
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Harvia M3 SL Wood Burning Sauna Stove
Sale price
$1,416.00
Regular price
$1,571.76
Shipping calculated at checkout.
Pickup currently not available
Description
The Harvia External Feed Wood-Burning Sauna Heater (14-WKM3SL) is the External Feed variant of Harvia's M3 wood-burning stove family, designed for compact residential saunas, garden saunas, and entry-level cabins. Available as a heater alone, bundled with 3 boxes of Harvia AC3020 sauna stones, or bundled with stones plus your choice of Stainless (WHP1500) or Black (WHP1500M) Harvia Pre-Packaged Insulated Chimney Kit for a complete chimney-ready install.
Four Package Tiers
| Package | Includes |
|---|---|
| Heater | 1 × Harvia External Feed Wood-Burning Sauna Heater (14-WKM3SL). Sauna stones and chimney sold separately. |
| Heater + Stones | 1 × Harvia External Feed Wood-Burning Sauna Heater + 3 boxes of Harvia AC3020 sauna stones (10–15 cm olivine diabase, 20 kg / 44 lb per box). Chimney sold separately. |
| Heater + Stones + Stainless Chimney | 1 × Harvia External Feed Wood-Burning Sauna Heater + 3 boxes of AC3020 stones + Harvia WHP1500 Stainless Steel Pre-Packaged Insulated Chimney Kit (1500 mm chimney pipe, 1 m smoke pipe, rain cap, rain boot, clamp, lead-through insulation and protector, and lead-through cover). |
| Heater + Stones + Black Chimney | 1 × Harvia External Feed Wood-Burning Sauna Heater + 3 boxes of AC3020 stones + Harvia WHP1500M Black Pre-Packaged Insulated Chimney Kit (same kit contents as the stainless variant, finished in black). |
Specifications
| Specification | Detail |
|---|---|
| Harvia Model | External Feed |
| SKU | 14-WKM3SL |
| Family | Harvia M3 |
| Stones (Tier 2+) | 3 × AC3020 (10–15 cm olivine diabase, 20 kg per box) |
| Chimney Kit (Tier 3) | Choose Stainless (WHP1500) or Black (WHP1500M) |
| Fuel | Wood (logs) |
| Country of Origin | Made in Finland |
Sauna Stones (Tier 2 and Tier 3 packages)
Every "Heater + Stones" and "Heater + Stones + Chimney" package ships with the correct quantity of Harvia AC3020 sauna stones, olivine diabase, 10–15 cm size grade, 20 kg (44 lb) per box. Wood-burning stoves use the larger 10–15 cm AC3020 grade because the bigger stones pack better in the open top-loaded stone bed and hold heat longer through the natural rise-and-fall thermal cycle of a wood fire.
Insulated Chimney Kit (Tier 3 packages)
The "Heater + Stones + Chimney" tiers bundle the Harvia WHP1500 Pre-Packaged Chimney Kit, the factory insulated chimney assembly Harvia ships for standard residential sauna installations. The kit includes:
- 1500 mm insulated chimney pipe
- 1 m smoke pipe
- Rain cap
- Rain boot
- Chimney clamp
- Lead-through insulation and protector
- Lead-through cover
Choose your finish: every heater in this family is offered with either the Stainless Steel (WHP1500) kit or the Black (WHP1500M) kit at Tier 3, the chimney finish is your decision, not auto-matched to the heater. Most customers pick the chimney that visually complements the room they're installing into: black for traditional sauna interiors, stainless for modern / commercial finishes.
Important: The WHP1500 kit covers a standard residential chimney run. If your installation deviates from the standard 1500 mm vertical configuration, longer chimney run, tilted offset, attic insulation penetration, multi-storey installations, or commercial roof tie-ins, additional chimney components (WHP1000 / WHP500 extensions, WHP270SP smoke damper, WHP-AS tilted accessory kit, etc.) will be required. Contact Finnish Sauna Builders before ordering for a chimney layout consultation.
Installation Requirements
Wood-burning sauna heaters require a non-combustible floor surface, proper clearance to combustibles per the installation manual, a code-compliant insulated chimney run penetrating the roof or wall, and adequate combustion-air supply. Always defer to the included Harvia installation manual and your local AHJ for final clearance, chimney, and venting requirements. Most jurisdictions require a permit and inspection on wood-burning sauna heater installations.
Installation Manual
Download the Harvia wood-burning sauna heater installation manual (family-specific manuals also available, contact Finnish Sauna Builders).
About the Harvia M3 Family
The Harvia M3 is Harvia's entry-level wood-burning sauna heater, a compact, robust stove that delivers the classic Finnish wood-fired löyly in smaller residential and garden saunas. Available in standard top-feed or External Feed (SL) configuration for through-wall installations where the wood is loaded from the anteroom side of the cabin.
This product page covers the External Feed configuration. Other configurations in the Harvia M3 family: Standard.
Why Buy From Finnish Sauna Builders
As an authorized Harvia dealer, Finnish Sauna Builders sources every heater direct from Harvia US (Lewisburg, WV) with full factory warranty and dealer technical support. Free shipping on most Harvia wood-burning heaters; white-glove install coordination available nationwide.
Warranty & Support
Harvia wood-burning sauna heaters carry Harvia's standard residential limited warranty. Finnish Sauna Builders handles all warranty claims direct, no third-party return desk.
About Harvia
Harvia has been building world-class sauna heaters in Finland since 1950. Every Harvia product carries forward more than 70 years of Finnish craftsmanship, materials science, and a relentless focus on the perfect löyly, the heated, humid burst of steam released when water meets hot sauna stones.